Metallic flue.



L. D. ARMSTRONG-- MBTALLIG FLUE.

APPLIGATION FILED APR.27.1909.

' Patented N0v.9',19o9.

Immunfff4 1 wigs.

' INVENTOR Avro/v 0. ARMsr-Ra/va.

LAYTON D. ARMSTRONG, 0F DALLAS, TEXAS.

METALLIC FLUE.

Speccation of Letters Patent.

Patenten. Nev. 9, i909.

Application filed April 27, 1909. Serial No. 492,460.

To all whom it may concern:

Be it known that l, LAYToN D. ARM- STRONG, a citizen of the United States, residing at 311 East Side avenue, Dallas, in the county of Dallas and State of Texas, have invented certain new and useful lmprovements in Metallic Flues, of which the following is a speciiication.

My invention relates to new and useful improvements in metallic fines. Its object is to provide a metallic fine consisting of an inner smoke-conducting fine, and an outer Ventilating flue, suiiicientspace being provided between the two fines to form an airduct furnishing ventilation to the building, and preventing the outer flue from becoming over-heated.

` Another object is to provide a double, metallic line, having suitable connections attachable thereto, to receive stove-pipes and furnish ventilation for the rooms of a` building.

Finally, my object is to provide a device of the character described, which will be strong, durable, simple and efficient, and comparatively easy to construct, and also one in which the various parts will not be likely to get out of working order.

lVith these and various other objects in View, my invention has relation to certain novel features of construction and operation, an example of which is described in the following specification and illustrated in the accompanying drawing, wherein:

Figure l is a sectional elevation of a building in which the flue is installed, parts of the outer Ventilating line being broken away to Show the interior construction. Fig. 2 is a perspective detail of a T connection used at the bottom of the flue to receive two stove-pipes. Fig. 3 is a sectional view of cross connection to be used upon the upper floors of a building to receive two stove pipes.

Referring now more particularly to the drawings, in which like numerals of reference designate similar parts in all the iigures, the numeral l denotes the outer ventilating line, 2 the inner smoke-conducting flue, and 3 the air space between the two. Stove-pipes at, connect-ed to said inner flue, furnish draft and an escape for the smoke,

to stoves 5. The T connection G at the lower extremity of the flue is double walled, and provided with Ventilating apertures T, which serve to conduct the air from a room into the Ventilating duct- 3 between the fines.

A flange 8 upon the vertical extension of the connection G is provided with a groove to receive the outer Ventilating flue, while the inner flue lits into a Suitable vertical aperture in said connection. The cross connection 9 is also double-walled, the air-ducts l0 serving' to conduct the air from a room through the ventilating orifices 1l and into the ventilating duct 3. F langes 12 similar to flange S upon the connection 6 furnish a bearing for the outer Ventilating pipe 1, the inner pipe 2 fitting into a suitable aperture, as clearly shown in Fig. 3. The chimney 13 is constructed of pressed sheet metal producing an imitation of brick.

lt is believed that a ilue of this construction will cost less and can be more easily installed than the brick flues in common use; also it will provide superior ventilation, inasmuch as there is no possibility of smoke or soot finding access to rooms through the ventilating apertures.

I am aware that changes may be made in the form and proportion of parts and details of the device herein-described and shown as the preferable embodiment of my invention, without departing from the spirit or sacrificing the advantages thereof, and therefore reserve the right to make such changes and alterations in said device as fairly come within the scope thereof.

lVhat l claim, is:

l. ln a. device of the character described, the combination with an inner, smoke conducting flue, of an outer Ventilating line, surrounding the same, cruciform double walled connections, adapted to be positioned in said flue and project laterally into rooms and a double-walled T-shaped connection, adapted to attach to the lower extremity of the flue :in an inverted position.

2. In a device of the character described, the combination with an inner smoke-conducting flue, of an outer Ventilating flue, surrounding the same, cruciform double walled connections, positioned in said tine and projecting laterally into rooms therefrom, a plurality of apertures Connecting the In testimony whereof I have signed my spaces between the walls with the rooms, and name to this specification in the presence of a double walled T shaped connection attwo subscribing witnesses.

tachecl to the bottom of the flue in an in- LAYTON D. ARMSTRONG. verted position, a plurality of apertures oonlVitnesses:

nectng the space between the walls with JEssm KIRK,

rooms. JOHN S. MURRAY. 

